Descloizite Mineral Data

Descloizite Mineral Data +

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General Descloizite Information

Chemical Formula:

PbZn(VO4)(OH)

Composition:

Molecular Weight = 404.54 gm

Vanadium 12.59 % V 22.48 % V₂O₅

Zinc 16.16 % Zn 20.12 % ZnO

Hydrogen 0.25 % H 2.23 % H₂O

Lead 51.22 % Pb 55.17 % PbO

Oxygen 19.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbZn(VO₄)(OH)

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist, Alfred Des Closzeaux (1817-1897).

Descloizite Image

Images:

Descloizite

Comments: Dark reddish brown, crystalline aggregate of descloizite.
Location: Grootfontein. Namibia. Scale: 3 cm.
© Fabre Minerals

Descloizite Crystallography

Axial Ratios:

a:b:c =0.8053:1:0.643

Cell Dimensions:

a = 7.607, b = 9.446, c = 6.074, Z = 4; V = 436.45 Den(Calc)= 6.16

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.23(1), 2.9(0.8), 5.12(0.8),

Forms:

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Forms: [ 2 1 0] [ 1 0 2] [ 0 1 1] [ 0 3 1] [ 1 1 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Qurashi M M , Barnes W H , The Canadian Mineralogist , 8 (1964) p.23-39, The structures of the minerals of the descloizite and adelite groups:, V - descloizite and conichalcite (part 3). The structure of descloizite

Physical Properties of Descloizite

Cleavage:

None

Color:

Dark brownish black, Dark reddish brown, Orange red, Reddish brown, Black.

Density:

6.1 - 6.2, Average = 6.15

Diaphaniety:

Transparent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Plumose - "Mica-like" minerals forming aggregates of plume-like forms.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5 - Copper Penny

Luminescence:

None.

Luster:

Greasy (Oily)

Streak:

light brownish green

Optical Properties of Descloizite

Gladstone-Dale:

CI meas= -0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2056,KPDmeas= 0.206,KC= 0.1892

Optical Data:

Biaxial (-), a=2.185, b=2.265, g=2.35, bire=0.1650, 2V(Calc)=88, 2V(Meas)=85-90. Dispersion relatively strong.

Calculated Properties of Descloizite

Electron Density:

r_electron=5.36 gm/cc
note: r_Descloizite=6.16 gm/cc.

Fermion Index

Fermion Index = 0.12023
Boson Index = 0.87977

Photoelectric:

PE_Descloizite= 915.15 barns/electron
U=PE_Descloizite x r_electron=4,905.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Descloizite is Not Radioactive

Descloizite Classification

Dana Class:

41.5.2.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.2)Dana Group

41.5.2.1 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.2 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.3 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.4 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

41.5.2.5 Duftite-alpha PbCu(AsO4)(OH) P 2₁2₁2₁ 2 2 2

Strunz Class:

VII/B.27-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.27 - Descloizite group

VII/B.27-10 Arsendescloizite PbZn(AsO4)(OH) P 2₁2₁2₁ 2 2 2

VII/B.27-20 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m

VII/B.27-30 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m

VII/B.27-40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m

VII/B.27-50 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m

Other Descloizite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)

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Print or Cut-and-Paste your Descloizite Specimen Label here :

Descloizite

PbZn(VO4)(OH)
Dana No: 41.5.2.1 Strunz No: VII/B.27-20
Locality:

Notes: